Means for clamping an inner form in an end part of a pipe



April 23, 11936 7 W, SHAFFER 2,6335%?)35 MEANS FOR CLAMPI'AJG AN INNER FORM IN AN END PART OF A PIPE Filed March 12, 1935 s Sheets-Sheet 1 Inventov W mm? Maggi??? Apmil 21 11936. FSHAFFER 37335 MEANS FOR GLAMPING AN INNER FORM IN AN END PART OF A PIPE Z; ,Z v v f i A ril 23, 19360 F. W. SHAFFER 9 MEANS FOR CLAMPING AN INNER FORM IN AN END PART OF A PIPE Filed March 12, 1955 5 Sheets-Sheet 5 Inventm' Patented Apr. 21, 1936 UNITED STATES PATENT OFFIQE MEANS FOR OLAMPING AN INNER FORM IN AN END PART OF A PIPE i Claims.

This invention relates to an end wall form for pipe culverts and the like, the general object of the invention being to provide means for clamping stave-s of a form within an end of a pipe, so

5 that the end of the pipe can be extended and formed with the end wall.

This invention also consists in certain other features of construction and in the combination and arrangement of several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:

Fig. 1 is a vertical longitudinal sectional view showing the form connected with one end of a 20 p pe.

Fig. 2 is a section on line 22 of Fig. 1.

Fig. 3 is a section on line 33 of Fig. 2.

Fig. 4 is a view of one of the straps for holding a hinge pin to a section of a ring member.

Fig. 5 is a perspective view of one section of a ring member.

Fig. 6 is a perspective view of the lining of said section.

Fig. '7 is a view showing how one rod passes 30 through an eye of another rod.

Fig. 8 is a view showing the eye part of the rod.

Fig. 9 is a detail sectional View showing how the strap is connected with a section to hold the hinge pin in place.

In these drawings, the letter A indicates an end portion of a concrete or other pipe and the letter B indicates the cylindrical form used for extending an end of the pipe, this form being composed of a plurality of staves b.

In order to hold the portions of the form B in the pipe A, I provide a plurality of ring members C. Each member is composed of four sections I having overlapping ends 2 and each section has a lining 3 connected to its convex face. 45 A strap 4 is connected to each end of each section by rivets or the like as shown at 5 in Fig. 9 and each strap has an inwardly bowed part 5 at its center which forms a bearing for a hinge pin 6. A pair of links 1 is connected to each-pin. 50 A rod 8 has its ends connected by pivot pins 9 with two sets of the links and a second rod ID has its ends connected by the pins II with the other two sets of links and each rod is formed of two sections having their adjacent ends threaded to receive the turn-buckles l2. As

will be seen, one rod extends at right angles to the other and the rod l0 passes through an eye I3 formed in the rod 8.

Thus, it will be seen that by placing the ring members C in one end portion of the pipe A and then placing the staves between the ring members and the pipe and then turning the turn-buckles l2, the rings are expanded to press the staves against the internal wall of the pipe so that the form B is firmly held by the pipe. Then the cement; can be placed around the exposed part of the form B, the cement being held in place by any suitable form of outer form D and the end wall form E extends upwardly from the outer end of the forms B and D to receive the cement forming said end wall of the culvert.

This invention saves a great deal of time and labor and a number of the parts can be used over and over again.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

I claim:

1. Means for clamping an inner form in an end part of a pipe comprising a sectional ring-shaped member adapted to be placed in the form, a link pivotally connected to each end of each section, a rod having its ends connecting the sets of links which are pivotally connected to adjacent ends of the sections, a second rod pivotallyconnected with the links pivoted to the other adjacent ends of the sections, each rod being formed of two sections and a turn-buckle connecting the sections together, and one rod having an eye therein through which the other rod passes.

2. Means for clamping an inner form in an end part of a pipe comprising a sectional ring shaped member adapted to be placed in the form, a link pivotally connected to each end of each section, a rod having its ends connecting the sets of links which are pivotally connected to adjacent ends of the sections, a second rod pivotally connected with the links pivoted to the other adjacent ends of the sections, each rod being formed in two sections and means between the rod sections whereby they may be moved toward or away from each other for contracting or expanding the sectional ring shaped member.

3. Means for clamping an inner form in an end part of a pipe comprising a sectional ring shaped member adapted to be placed in the form, a pair of rods crossing each other in cruciform relationship and one of the rods having an eye through which the other rod passes, said rods being formed in sections, means for moving the sections of the rods toward and away from each other, and means operatively connecting the ends of the rods with the sections of the ring shaped member whereby adjustment of the links of the rods will cause expansion and contraction thereof.

4. Means for clamping an inner form in an end part of a pipe comprising a sectional ringshaped member adapted to be placed in the form, a pair of rods crossing each other in cruciform relationship, and means connecting the ends of the respective rods with the sections of said ringshaped member for expanding and contracting said sectional ring-shaped member, said means including links pivoted to the sections of the ring-shaped member and means connecting said links with the rods including elements axially adjustable relative to the rods and connected with certain of said links for transmitting movement to the sections of the ring-shaped member for drawing said sections toward or away from one another.

5. Means for clamping an inner form in an end part of a pipe comprising a sectional ring-shaped member adapted to be placed in the form, links pivotally connected to each end of each section, a pair of rods crossing each other in cruciform relationship, and connections between said links and the ends of said rods, the connection between one end of each of said rods and a pair of links including a member threadedly engaged with said end of a rod for axial adjustment relative thereto for expanding or contracting said sectional ring-shaped member.

FRANK W. SHAFFER. 

